Resource Centre Tea and Hydration

Independent scientists agree that tea is an excellent fluid for healthy hydration. A healthy adult should aim to consume a daily intake of 2.2 - 2.5 litres of fluid every day, with tea being a suitable beverage to add to your intake.

It is a common myth that tea acts as a diuretic because of its caffeine content and may therefore compromise hydration. Review of the scientific literature regarding this debate highlights the following:

  • Only water surpasses tea as the healthiest hydration fluid making it an excellent alternative to water for good health.
  • Tea is hydrating- not dehydrating. The levels of caffeine in tea will not dehydrate individuals, particularly because any initial diuretic effects will diminish in regular tea drinkers once a caffeine tolerance has developed.


  1. Gardner EJ (2006). Black tea-helpful or harmful? A review of the evidence. Ruxton CHS, Leeds T, eds European Journal of Clinical Nutrition, 1-16
  2. Popkin BM et al (2006). A new proposed guidance system for beverage consumption in the United States. American Journal of Clinical Nutrition, 1-16.
  3. Howard G & Bartran J (2003) Domestic water quantity, service level and health. WHO Report.
  4. Maughan RJ & Griffin J( 2003). Caffeine ingestion and fluid balance: a review. Journal of Human Nutrition and Dietetics, 16(6): 411-420.